Boiler



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June 26, 1945.

W//VESS.'

Patented June 26, 1945 UNIT ED STATES PATENT OFFlCE .Bomen clarence D. vGibbs, Jenkintowulan Rotertk.

Miller, Allentown, P... Application Feb-mary 1o, 19,44, serial Nasr/1,716

@meets .for 'the present invention are, nrs't, to provide compact, reliable and efficient lboiier equipment vih-ion may be arranged as a unitary structure and transportable 'as such; second, to 4effect an 'e'o'ono'r'nt7 in the 'generation of steam; and, third, to provide an improved fboiier 'both in vrespect to construction `and operation.

Other objects of 'the 'invention will appear from the following description at the end Iof *which the invention will be claimed;

vGenerally stated the invention 'comprises the 'improvements hereinafter described 'and finally claimed. f

In 'the following description reference will be made to the accompanying drawings frning partnereor and in which,

Figure l1 is an elevational i'ievv 'principally in section of a boiler or steam geriera't'c'x` embodyingfea-ture's of the'invention.

Figure 2 is a transverse section 'taken' 'on 'the 'line 2--2 of Figure l and drawn vto an enlarged scale.

Figure 3 is "a. 'View principally in transverse Seotion 'on the line @-3 of Fig. l drawn 'to "an enl'arged scale and illustrating 'details of construction.

Figure 4 is a transverse sectional view drawn to an enlarged scale of the construction shown at the -left hand in Figure 3.

'Figure f5 is a sectional View drawn to an -enlarged scale and illustrating the superheater tube; and

"Figur-'e A'6 is a View illustrating 'one nean's b5 which the burners can be operated individually or fin fgroups.

Referring to the drawings, the 'boiler proper may be 'described as fol-lows: Two spaced parallei vertical plates 3 and 1 form one Water lee' of 'the boiler 4'and two `other plates '4 and 8 parallel to l'and spaced from the said plates 3 and 7| If'orm a lsecond water leg. The space between 'the two Water legs constitutes a passage 6' for products ofl combustion. There are a f'series of vpairs of tubes `l 'and fl each arranged one within 'the other with an annular space between them. The inner tubes provide combustion chambers and the space between the Vtubes of` ea'ch pai-r provides 'Water space vWhich communicates with Water in the said Water `legs at each 1end of `the construction. 'The respective pairs fof tubes are spaced -from each other and heat iis 'imparted 'to the outer tubes from 4products of combustion in tubes `I and in passage 6". The inner for 'fire tubes I extend at their 'opposite ends through tube sheets 3 and 4 and "communicate at their left hand `ends with 'air inlet duct 5 and at their right hand ends with an offtake passage 6 for products of combustion. The outer tubes 2 are mounted at their ends in tube sheets 1 and 8 and eomrnunicate with kthe water legs of the and 4'i-'Siitilg'l'l'i'fsh'ed individually -"Oi in groups-eiceo'ordin'g to the Aboiler demand.. 'Referring itoriisf ure 3 *the loil burners are arranged to 'be pr'oeted in't' the open ends of 'the ftubes 'and to be 'withdrawntnereirom When withdrawn from the fi're tubes, as vSl'lovifn -n Figure 3, they lt'ife Vignited automatically by' reason or the nigh teme perature of the air inthe Aair Tinl'et duct Send :when .projected Sinto 'the tubes vl theirv are'xtiinlguished vbecause the supply of oil and 'air-to 'tl-rein is automatically `'eilt-ofi. The burners are-pro'- jected by springs I l acting 'upon piston lheads 'I2 lsliieilola in cylinders 'I3 'and "they are 'retracted by Ace'repressed all applied thfogh'the 'lle's f6 tothe right 'hand face of the piston. When 'the air 'pressure lin'thepipes |56 s out the 'springs are free tooperate 'in the finanner deseribedia d the tip's 'of t-he burners we projected i'nfto'tl-I'e tubes I. Oil for combustion is supplied through the oil inlet 14 to theinner 'tips of 'the 'burners and the air is supplied around Athe 'outside of the "inner tips "of 'the burners. In this 'Way "the burner tips "ar'e kept 'free 'from deposits. Et5 iis fan 'exhaust connection for 'the air 'applied to the Tpiston. It may 'be noted that the Sinni/ement of the.

burners serves to open and close the oil and fa'i'r supplies.

Air for supporting cornb'uv tion enters-at 120, is screened fat 2|, and 'under fthe -iniiuence of the ian 22 driven bythe Azii-rotor vv23, Vis 'passed down'- 'Ward through the `duct 4k24 through the -preheater 25 and ascends through the air inlet duct l"l. The hot products of combustion pass around the coils of the steam superhe'ater 26, descend 'through Apassage 6 'aroundthe outside of Lthe respective pairs of tub'es, and pass 'horizontaliy through the air fprehe" ter '25, and ascend through the feed water heater 21 and are bythe -'exhaust fan 28 expelled'to the atmosphere.

Referring to Figure 2, the air preheater is 'of 'the 'plate type loor'isisting of long 'flat tubes 1D0 ofA metal 'separated to form alternate air and 'gas or hot products 'of-combustion passages between the tubes, -With the Whole welded in'to Ia horno-l `ge'neoujs unit. Ribs 'or vanes 1I Ui on ithe-"tubes 2100 div-idethe space Vbetween the tubes into nuvin'er'ou's :gas Vpassages of square cross section.

The ai-r flows through its vpassages in 'a l'straight line but the gas enters across the `sheets and Iis then lredirect'ed longitudinally along 'the 'sheets to the other end 'Where itleaves the passages by again owing vacross the sheets. vThe -lfeatures of the "ga's 'passages are the combination oi 1ongiftudinal and transverse new, vand the use or vanos IUI Welded to the tubes H10 to `obtain fictif.l f

'The steam after leaving tne'fboiier and. before entering ythe Sup'ee'ater i's .passed fthroughflthe drums 29 and 30 which serve to remove entrained water which is returned to the boiler by way of the passages 30", 3| and 32 along with the feed water which isl introduced into drum 29 by way of the connections'lilv and equipment 34 after passing through preheater 21. The motor driven pump serves to cause circulation of water in the boiler.

It may be remarked that the temperature ofl the air is suirlciently high to ycause ignition of the burners when the oil supply is turned on. Initially one or more of the burners is Y'ignited by means of a blow torch or of anyv other'convenient means.

It may be further remarked that air for cooling the inner tips of the burners is supplied from the compressed air connection I6. From this same source air under pressure through manual control is availed of for operating the burners. Referring to Figure 6 the pipe a is shown as vprovided with a valve b and with a header c with which the pipes I 6 communicate and the pipes I6 are shown as each provided with a, Valve d. 'I'he pipe a communicates with a source of air under pressure not shown.

When the burner is moved back and forth the piston covers and uncovers the oil supply connection I4 and, as has been said, the compressed air supply IE is controlled manually.

The described elements are all contained in a .l

housing 36 so that the complete unit, if desired, may be assembled and transported ready for installation. It may be remarked that the embodiment Vof the invention herein described may be assembled and mounted on the chassis for a wheeled frame of a locomotive. i

It will be obvious to those skilled in the art that modifications may be made in details of construction and arrangement without departing from the spirit of the invention which is not limited as to such matters or otherwise than as the prior art and the appended claims may require.

We claim: 1. In a boiler` or steam generator the combination of a plurality of assemblies consisting of an combination spaced tube sheets arranged in pairs spaced apart and forming water legs, the space between the said legs constituting a passage for combustion gases, a series of burners outside one of said water legs, a multiplicity of inner and outer tubes arranged in pairs and spanning the said passage and of which the outer tubes communicate with the interior of the water legs and of which the inner tubes span the water legs and open through the outer tube sheets for cooperation with the said burners at one end and for the discharge of hot products o1' combustion at the other end, means for introducing feed Water into the water legs and for withdrawing steam therefrom, means for passing hot products of combustion through the said passage between the water legs and around the outer tubes, a flue into which the inner tubes open and which is supplied with air heated to a high temperature byl the products of combustion, there being provided an air heater for this purpose, means for inner tube and an outer tube, a chamber in which the tubes are assembled, an oil burner arranged at the entrance of each inner tube, means for returning the hot products of combustion outside of the outer tube and through the chamber, means for supplying water outside of the inner tube, and an air heater supplying air to the burner and heated by the hot products r of combustion.

2. In a boiler or steam generator the combination of a plurality of assemblies each consisting of an inner tube and an outer tube, a chamber in which the tubes are assembled, an air heater and means for supplying hot air toV the inner tubes at a temperature sufficiently high for igniting the fuel, a series of oil burners and means to project and to retract the said burners with respect to the open ends of the inner tubes and thereby to extinguish and to ignite the said burners individually or in groups.

3. The combination substantially as described in claim 2 and in which the individual burners are connected with a compressed air supply which actuates the said projecting and retracting means to cut off and to admit oil and compressed air.

4. A steam generator or boiler comprising the combination substantially as described in claim 2 and in which the parts recited therein together projecting and retracting the said burners across the hot air flue and into and from the open ends of the inner tube the said burners being automatically ignited by the hot air in said ue when retracted, and means for individually extinguish" ing said burners. v I

6. A boiler or steam generator comprising in combination spaced tube sheets arranged in pairs spaced apart and forming water legs, the space between the said legs constituting a passage for combustion gases, a series of burners outside one of said water legs, a multiplicity of inner and outer tubes arranged in pairs and spanning the said passage and of which the outer tubes communicate with the interior of the water `legs and of which the inner tubes span the water legs and open through the outer tube sheets for cooperation with the said burners at one end and for the discharge of hot products of combustion at the other end, means for introducing feed water into the water legs and for withdrawing steam therefrom, means for passing hot products of combustion through the said passage between the water legs and around the outer tubes,-a ue into which the inner tubes open and which is supplied with air heated to a high temperature by the productspof combustion, there being provided an air heater for this purpose, and means for individually lighting and extinguishing said burners.

'7. A boiler or steam generator comprising in combination spaced tube sheets arranged in pairs spaced apart and forming water legs, the space between the saidlegs constituting a passage for combustion gases, a series of burners outside one of said water legs, a multiplicity of inner and outer tubes arranged in pairs and spanning the said passage and of which the outer tubes communicate with the interior of the water legs and of which the inner tubes span the water legs and open through the outer tube sheets for cooperation with the said burners at one end and for the discharge of hot products of combustion at the other end, and means for individually lighting and extinguishing the oil burners.

CLARENCE D. GIBBS. ROBERT K. MILLER. 

